Jewel-blank-shaping machine.



A. GABUS.

JEWL BLANK SHAPING MACHINE. APPLICATION FILED DEC. 2. ISIS.

1,302,907. Patehted Muy 6, 1919.,

3 SHEETS--SHEET l.

62 fr' f`| 'iff f3 IHNLIIIIIIIIHHHH J1 z' x A. GABUS. JEWEL BLANK SHAPING MACHINE. APPLICATION FILED nrc. 2. Is'Is.

n 1,302,907. I Patented May 6, 19m.`

3 SHEETS-SHEET 2.

*Mein .535, y ML@ 44%,

A. GABUS. News. BLANK 'summa-MACHINE. APPUCTUN FILED DEC. 2. 95 1,302,907. y v Patented May 6, 19151.

3 SHEETS-SHEET 3.

To all 'whom it may concern: 'Be it known that I, ADRIANk .com anus, or millenium, e

GABUs, a

ik l citizen of theRepublic of Switzerland,.and

vterials commonly used a resident of Springfield, in the: county of Sangamon and State of Illinois, ave invented certain newy and useful mprovements in J eWel-Blank-Shap'mg Machines, of which the following is a specification, refyerenee beinghad to thek accompanying drawinvention relates to the manufacture of jewels auch` as are used other delicate instruments. 4One of the miifor such jewels is sapphire, butk urpose. Such stones are furnished to the jewel makerin the form of thin slabs of the properv thickness and of lllegllll perlpheralcontour, and suchslabs must be made truly cylindrical and must be reduced very exactly to av predetermined diameter in orderv to fit in the socket in which they are properly fashioning the raw material is one of extreme nicety, and as heretofore practised it has been expensive perform. The object kof mypresent, invenapproximately tion is to rovide anew and improved machine for aping the slabsabove mentioned into cylindrical blanks mansions preparatory treated to make the be understood that the blank formed from the slab, which beqmad'e eitherinto a cup jewel or a rin l able `for shaping jewel jewel, depending on the pur it is to be used.` f If it is to made intoa cu jewel, one hatl surface is cupped or pro- 'vi ed with ammi-spherical t recess, whereas if a ring' jewel is to be made, the 'blank' is bored entirelylthrough to give tthe formv of a thev edges being, of course, roundedandt e surfaces lished so ,that friction will be reduced to t e minimum. My preslent invention is not, however, .concerned with the treatment ofthe jewel materialbeyond the stage of forming the blank'roin the slab.

ThefproblemA of almachinesuitl blanks is: an exceedslab being rotated at high s for the bearings of chronometers, electricity meters, and

sive, such to be set.` The work of' so andy difficult to lof the proper diy' to their being further` iinished jewel. It ywill f constructed then-is a thin Hat disk, may` e for whic JnwmiavLaNx-snarmc incarna.

semina. man'.

ingly the work must be done with extremey aocuf rac in order that the jewel will t closely .an rml l in the lace arranged'to receive it, the di culty o securing suchv accllracyv being greatly increased because of the'ffact that-such jewels um: very small. The only practicable way orf shapingrtlie slab is to grind 'nding o ration. t erefore, t is su It wi all be so mounted as nottodeviateeven in' which t ey are ori ally set, o t blankformed wou d be imperfect lsince its eripheral surface would not be true. `Secdiicult one'for several reasons. y

k() f it to the'properfshape, fthe l during 'the' be apparent,y t at the devices by` which e slabv and r otated and `also thede 86 l vices y which the grinding is eected,`,mustp variousk other precious or""the sli htesty degree from the tosiftin m Asemi-precious stones are also use'dffor the rwise the v ond, the hardness of theimaterial o crated upon requires the useofna. very ha ground from the slab is also Agiven oli in theform of dust, so that it isi'necessary o construct the machinev that ythe bearin which position the operating'fparts shall protected from such dust, othcrwiseyjthey will'not only wear out rapidly but will also become inaccurate in a comparatively short 4 y abraas diamond dust, and the material j time.y Third, the machine vmust be capable" of'adjustment in a variety t it to operate on slabs of different thicknesses and to lproducebl'anks'of diierent diarnejf ters, 'but the adjusting devices'gmustbe so ofways to adapt 'n as to lbefcapable of very exact* j andy fine regulation. Fourthgit is :necessary that the machiiie'to be successful, be to a` large ory nofattention beyond putting the slabs in place and .removing 'them is finished.

extent automatic so as to require little"` no whentiebiiink` The machine which `forms the subject-j matter `of thisvapplication yovercomesjall irregular peripheries so^that "such `blanks are ready to be i from slabs having 95 lthese hfdiiculties andy operates with entire.. e success 'to shape blanks furthertreated, for the proy duction of` theffinished jewel', yby cupv ing; 10Q`r`r 1`is`an elevation ofmy improved v tubular bearings c .y Referring slab'is supported lwhile being operated upon and the lap by which the slab, is un down to cylindrical form, together with the devices bywhich the'lap is supported and operated 5 Fig. 2 1s an elevation taken.l at right angles to the viewxof'Fi 1;

Fig. 3 is an enarged detail, being a par tial ,vertical Section on line 3- -3`of Fig. 1l

Fig. 4 is a partial longitudinal-vertical* section on line 4-4 of-Fi 2; 1 A

Fig. 5 is an enlarged dtail, be' a partiatl1 vertical section on line 5-.5 o Fig. l. an

Fig. 6 is an endy view of one of the elastic which are used to support alilid1 protect the two main shafts of the ma to the drawings, in which is illustratedthe preferred embodiment of my invention,-7 indicates the base. of the machine and 8 a tubular edestal secured upon the base in any suitab e way. As indicated by the dotted lines in Fig. 1, said pedestal is provided with a vertical passage therethrough, which is circular in cross-section, and extendin downward from the up r end of the peestal, at one side, isla slot 10, also indicated by dotted lines in Fig. 1 This slot extends downward a considerable' distance, and its purpose is to permitthe upper portion 'of the pedestal to contract and expand slightly so that it maiy o crate as a clamp, as hereinafter describe Kt one side, near its upper end and at opposite sides of the slot 10, the pedestal 8 is provided with lugs 11, one of which is shownin Fig. 2, the arrangement being such that b pass# ing a bolt 12 through said lugs, one o which is screw-threaded, the upper portion of the passage through the desta maybe ex panded or contracte for the purpose stated.

-13 indicates a standard, which is provided with a stem 14 of reduced diameter, adapted to fit telescopically in the bore or passage of .the pedestal 8 so that the standard may be vertically adjusted with'regard to the pedestal. B means of the clamping bolt 12 the pedestalY may be clamped-tightly upon the stem 14 so as to hold the standard 13 against vertical movement. The stem 14 is prevented from rotating in the pedestal by means of a feather 15 which lits in the slot 10, as shown in dotted lines in Fig. 1. 16 indicates an adjusting-screw having a handle 17, said screw being iitted in a suit-y able screw-threaded bearing in the base 7` disposed concentrically with reference to the axis of the pedestal 8. The upper end of said screw bears against the lower endof the stemv 14 so that'b means of said screw the standard 13 may he raised. The standard may be lowered by moving the screw 16 integral with the'mandre preferab y ninet de down out of contact with the 14 so that said Stem may be 'pressed down inits socket. By this constructlon a ve justment of the standarldY tained.

18 -indicates a' hollow block, carried at'the uvper end of the standardv 13, inclosing a amber 19, as shown in F' 4920-21' indicate ,horizontal sleeves wliich extend in opposite directions from the ends vof the chamber 19,'as shown in Figs. 1 and 4.v The outer endA vided wit screw-threads to cup-like caps 22-23, respectively, which upon them, as shown in Figs. .1 and.4. 24` indicates a shaft or mandrel which. extends longitudinally through the .sleeves 20 and 21 and the chamber 19, and also through the caps 22 and 23, said caps' 'being perforated centrally tol fit closely u n said 25-26 indicate: voppositely-disposed conical bearings carried by the mandrel 24 at points corres y nding approximatel with opposite en of the chamber 19. 'Yhese bearlngs are formed receive deelt)` referably bearing. surfaces extend towardV the ends of the sleeves 20 21,rpectively. 27-28 indicate two similar tubular bearings, which are split longitudinally as shown at 27a in Fig. 6, and are also provided with longitu ooves' 27" suitabl spaced apart, m each other and from the s ot 2 as shown in said figure. .While I prefer to use three of such grooves, any suitable number may be emfiloyed. As I )est'shownl in Fig. 4, the tubuar bear' 27-28 are tapered externally, and at their-inner ends are beveled, as shown at 27 and 28 in Fig. 6, against the conical bearing surfaces 25-26, as shownin Fig. 4. The inner surfaces of the sleeves 20-21 are also tapered to receive `the tapered tubular bearings 27-28, and the bearings is such that when in ition they project slightly beyond the en s of said sleeves 20-21, .so thatthe caps 22-23 may engage the outer endsof sald tubular bearings and act to force them closely against the conical bearing surfaces 25-26 and hold them in position. to the fact that the bearings 27-28 are slotted or grooved made of material sucientl purpose, the may be seatedy respective s eeves 20-21 caps 22-23. Each of the 27-28 is bored centrally, in Fig. 6, so as to lit closelyV upon the mandrel 24, and they are so proportioned that when in operative position they are not contracted suiliciently to close the slots 27.

elasticv forv the tightly in their by'means of the tubular bearin rtionsof vthese sleeves are proand their conical longitudinally and are' line vertical ad' 13 .may be obsol so as to t closely v as shown at 2 l I A suitable lubcant is placed in the cham- `ing extended bearingjsurfaces for the man- `admission. of abrasive material, such ask diamondor sapphire dust,"which, while the `machine is in operation, is `carriedby the v air in the vicinity ofthe machine.

As the' air nearest the work carriesa larger reenta'geof such abrasive dust, I provi e a rotat' supplemental cap 29, which fitsk loobldlry overy the cap .23, and fitsy closely upon the adjacent end of the mandrel `24 so as tobexheld thereon "by friction, as best shown in Figs.v 1 and 4. r The capyf29 serves 'u8 a hoodA to prevent abrasive material 1n the air from coming immediately into con tact'with the bearing surfaces'of the manydrel and cap 23, and also by its rotation acts to direct abrasive particles away from said `ca Oil'` is supplied to the chamber 19' throng` a suitable opening closed by a cap 30,`shown in Fig. 1, or in any other suitable u way. By providing a chamber for 'lubrl-` cant, euch as that described, before beginning operations for the day, asuicient suply of lubricant may be placed 1n the chambei* to lastall day, so that the necesslty of opening the lubricant chamberwhlle the air f 1s more o'rles's impro` ated with abrasive f 1 `matter dustis avoided, and esides, lthe workman is not uired to give'any attention to the di lubricatlon while operating the machine.

31 'indicates a* pulley lmounted upon the-- mandrel' 24, at the left-handend thereof as shown in Fig." 4, Vand'helld in position by a. set-screw32`sothat itmay readily be removedv when necessary. The pulley 31 'is 1 driven `from any suitable source of power,

preferably b fa belt, but-I wish it "tobe understoodt 'at any other suitable means maybe employed for rotating the mandrel.

\ The 'oppoeite end of themandrelisprovided Witha ta ered socket-33 concentric with the axis of t e mandrel and. adapted tofreceivey the tapered shank'34 of a chuck `35. The shank- 34 yfits closely'in the rsocket 33,'f1n- `whiehit vis held by friction, .so that the' f chuck rotateswith the mandrel.. The chuckl 35 is provided with a socket 36`-wh1ch is concentric with theax's vof the mandrel =and is adapted; toreceive the stem of a pin 37,` the outer end of whichis adapted to the slab "to `be operated upon', and

.come

`a contento` support theslab` in a suitable centric with ft head'40.

while it is operated*l b be vhereinafter described. y lha pin37 cured in the chuckb. by a 'the lap, 4as will thatipxmay L easily be removed. orbe u1-V )usted to compensatef for variation in the w thickness of fthef slabs operated upon `head 1 8, so dis Sed that the stem 39viscon- 40y a horizontally-` disposedhead the, 'steln 39, head bei groove'd longitudmally ini" its upper-"su aceto receive a sllde-bar 41, asshown in'Fig.v 1.-

slidehead`40 overlies the sleeves 20e-21- a set-screw42,' shown 1n Fig. 1. 43 indiof the `slide-bar 41, as shown in Fig. 1.., 44v mdlcatesa dependim;` arm secured at the opposite end of said screws 4 5. end acenter 46, the point axis of the pin 37, asshown in Figs. 1 and 2. The center 46'is e axisfoffthe standard`-13,-` `which axls also intersects ,the of the mandrel 24.

mounted `on or integral with slide-bar, preferablyl The arm 44carries at its lower of which is adapts` l ed to be broughtinto alinement with the providedy with a stem 47" 39iindicatesaeylindr1cals`tem, which fits socketin the upper and` ofthe? (soy f ybar n is preferably' rectangle 1in k1l-oa.; -sectlon and `fits closelyin thegroove inthe h ead 40 so that while it may move longitudlnally 1t 1s incapable of rotation. The i '85, normally held fixedlyn in suchpoeitionbirl `cates afknob provided 4at the left-hand rmly feo which iits'in a suitable socket inythelower end of in position by a set-screw 48, shown in Fig. 2.` By this means removed when neces. or may be adjusted. 49 indicates a springavirvhi the slide-bar 41 to the the arm 44, and said stem is secured the center may beieasilv *,190

chnormallyfpresses i left, asqvshowny in.

Fig. 1, said spring being mountedv in ai pocket 50 carredby a plate `51 secured tothe bar 41 near the handle 43, as shown.y Thus f thetendencyfof the springis tomove the slide-bar `41y to the-left thereby movingthe y `center`46 toward thepin 37. The operator.

lacing the ,'-palm' of his hand .onxthe `le '4.3y and st eiziing` 'the head 40"`with hie ners, ma easily compress thespring 49 an e slide-bar 41 to theright when y, y he wishestdrelease the slab operated uponi;

by han move f volf-to place a `mivvslab inpositiom -When `he relexeshs grip, fthe spring` willauto-py matically'move theslide-bar 41 to the left land causethe center 46to engage'theslab. .no y

53 indicates a slabjin positiongbetween the desired todo so the yend of .the pin 37 andthe center/16. Thel i tension t of the spring 49 is sullicient tohold t the fslab in place while-it is.beine;'operated` upon. yIt willbe apparentthat when it is operator may swing the Aslide-baz- 41 aboutyita` stem 391asan axis;

by first looseningjthe set-screvr42,.but.ordi f 1er. l The outer end of the ,spring 49 bearsagalnst a plat'e52 secured `.tothe slidef.

with the bearings 27-28." This difference is narily there is no "occasion to swing the slide-bar 41` as after it is once set so thatl therefore the relation of the center 46 to the.

pin 37 is not varied by reason of such vertical adjustment of the standard 13. l

The shaping of the slab into cylindrical form is effected by means of a lap 54 rotated at high speed and carrying a suitable abrasive, such as diamond dust, on its periphery. The maner in which the lap is mounted and operated will now be descrlbed. Referring particularly to Figs. 2, 3 and 4, 55 indicates a shaft or spindle, upon one end of which the lap 54 1s mounted, as shown in Fig. 3,- it being held in position by a clamping nut 56 screwed upon the end of said shaft, as shown. The lap is clamped against the reduced end 57 a of the hub 57 of a cap 58 similar to the cap 29. The hub 57 lits closely u on the shaft and frictonally engages t e same so that the ca 58 rotates therewith, in the same wa and or the same purpose as the cap 29. T e shaft or spindle 55 extends through a head 59 carried at the upper end of a ivoted arm 60 which is mounted as will hereinafter specifically described. Said head is provided with oppositely extending sleeves 61-62 which are externally screw-threaded and internally tapered in much the same way as the sleeves 20-21. Mounted in said sleeves are tubular bearings 63-64 very similar to the bearings 27--28. The only difference between the bearing 63 and the bearin 27-28 is that it is internally beveled at its larger end instead of at its smaller end, as -1s the case to adapt the bearin 63 to fit upon a conical bearing 65 carried.' by the vshaft 55 adjacent to the hub 57, as shown in Fig. 3. The tubular bearing 64 differs from the bearing 63 in that it is not internally beveled, sincethere is only one conical bearing on the shaft 55. The head 59 between the tubular bearings 63-64 forms a chamber 66 for lubricant, similar to the chamber 19. The chamber 66 is supplied through a passage 67, closed'by a cap 68, as shown in Fig. 3. 69- 70 indicatecup-like caps which screw upon the sleeves 61-62 in the same way as the caps 2 2-23, and in like manner act to force the tubular bearings 63-64 down in their seats and hold them invposition. '71 indicates a pulley mounted on the spindle 55 adjacent to the cap 70 and secured to said spindle b a set-screw 72, or other suitable means. he pulley 71 is provided with a hub 73 which preferably extends throu h the cap 70, as shown in Fig. 3. The p ey 71 is driven from any suitable source of power,

and accordingly drives the spindle 55 and lap 54 at the requisitespeed.

The arm 60 which carries theV head 59 lare flared, as shown in Fig. 5. 76 indicates a rock-shaft which extends through the passage and is of sli htly less diameter passage.

and are movable longitudinally thereon into engagement with the flared end portions of the assage 75. B adjusting the blocks T7-7,8 upon the shag 76, the arm 60 may be moved longitudinally of said shaft, and by removin blocks 77-78 in position. The rock-shaft 76 is mounted between trunnions 81-82, in the form of lscrews fitted in standards 83- 84, respectively, whichare mounted on the .base 7. B this means the trunnions may be adjusted ongitudinally of the hub 74 to move said hub in one direction or the other, thereby adjusting the spindle endwise of itself and adjusting the lap transversely with reference to the vertical plane in which the mandrel 24 lies. 85-86 indicate set-screws for securing the trunnions '8l-82, respectively, in their different positions of adjustment, said set-screws being mounted in the standards 83-84, as shown in Fig. 2.

As :best shown in Fig. 2, the lap 54' is mounted so that its periphery is in the same vertical plane as the axis of the mandrel 24, and itwill be apparent from the foregoing 'descri tion that` the lap may be swung in said p ane toward and from the work by rocking the head 59 about the axis of the shaft 76, thereby moving the lap into engagement with a sla'b held inposition between the pin 37 and the center 4It will be evident that the diameter of the jewel blank formed will bedetermined by the position of the highest peripheral point of the lap, and the lap reaches its hlghest position when the axes of the shafts 55 and 76 are in the same vertical lane. Normally, the head 59 is thrown bac or to the right of th e position shown in Fig. 1, in whlch positlon it is supported by a disk-cam 87 which bears against` a roller 88 mounted at one sideof the arm 60, as shown in Figs. 1 and 2. Said roller is normally held in contact with said cam by means of a counterwhich projects from the arm 60, as shown in Fi 1 and 2. The weight 89 may be adjuste to vary its action by sliding it upon the pin 90, and it may be secured in position a set-screw 91, shown in Fig. 2. The cam 8 is mounted upon a shaft 92 pivoted one of said blocks, the shaft mayv -be with rawn from the hub 74. 79-80 inp dicate set-screws for securing the wedgethan said y 77- 8 indicate wedge- 'I blocks hlch are fitted upon the shaft 76 balancing weigh-t 89 carried by a rod 90 in a sleeve 93 -rcarried by a fixed standard 94 mountedy on the base, asfshown. in Fig. 2.

The shaft 92 carries a pulley 95 -by means of which it may be'rotated froml any suitable source of; ower. 96` indicates a spring carried byga racket-97 secured to the base, as shown in Fig. `2, and having a pin 98 which adapted to enter a. hole99 'in the cam 87,

` said pinenters the hole andk locks thev cam against rotation. These yparts kare so 'adjusted that the cam is locked immediately after the* roller 88 passes off the highest "point 100 of thecam. When thishappens,

j the cam: .and the head 59 is freeto l swing toy the right until the rolleragain en' the periphery of the cam at the point wherey its raxllus isshortest. The stoppage .of the cam is permltted by the slippingio the driving belt upon the ypulle 95(y It will be undelstood thatthe cam 8 isfrotated"`slowly, its `rotation being instituted `by manual movement of. 'the spring 96 to the right, as shown in 2, so as to release the in 98y ,ronif`7the hole 99.' The belt lwhich rivesthe pulley 95 being constantly driven, as soon as the pin 98 releases the cam, the latter begins to rotate, and,

owing `to the eccentricity ofN its periphery,

4 moves the head 59 to the left or toward the ysolthat when it approximates the drawin of the lip standard 13. This carries lthe lap over to' ward the workand at the same time raises it shown in Fig. 1 .1t engages the s ab and grinds it. While this operation is taking place,iboth the lap and the slab are belng rotated athigh speed. As the lap advances, the grinding operation continues until the lap reaches its highest point and passes across theperipheral portion of. theslab. Soony after this occurs the high poln'i'l 100 will pass olf the roller 88, thereby permitting the head-59 to swing back to its inoperative osition, and the rotation of thel camtwill arrested by the engagement of the pan 98 withv the hole 99. The jewel blank formed by this operation vmay then be removed and another slab put in place.

. Water is applied toy the slaband lap duringthe grinding operatlon through a nozzle 101 connected toa tube 102 which extends through a tubular standard and isy supplied kwith. water from anysuitable Isource. Iy prefer. to make the upper end of the tube 102-lexible and itis preferably coveredbyza suitable ywrapping, `as illustrated lin the All but the operating portion is inclosed 1n a housing 104' having ay removable front plate 105 prefer` ably secured in lace b screws 106, as shown is lhousing 1s fitted consequently around the portionv 57l ofy thelcap 58 andapproaches closely 'thereto so that receptacle, where the diamond and sapphire` dust resulting from the grinding operation may be recovered. "The housing 1s firmly #supported 1n place by a bracket 109vsccured to 1t and tothe arm `60,' as shown'in Fig. 2. It will be evident from the fo ing descrlption thatlthe machine descri opcrates .to a large extent'` automatically, since all that `the operatorr has to do isA tovapplyv 'the slabs andremove the jewel blanks, and loperate the sprin 96 `to release the l'cam 97 Whenever a. new` s abhasbeen ut in` place. V The several parts of theI mac ine ma Vbe very accurately adjusted, andy the bearings, and particularly ythose-exposed to then-tine dustcaused by the inding operation, are `fully protected, an consequently the machlne may be operated for a long time without requlri any adjustment, or the replacement o parts. j `It willbe .understood that. whileI have described with considerable particularty the construction illustrated in the'drawings, my invention is not limited to the specific construction lshown exceptin so far as it is particularly claimed, but includes generically the subject-matter of `the broader G1&II1S .7

. That which I claimyas m invention, and desireV to secure y'by Letters atent, is,-

1. Aemachine of the class described, comprising means `for supportingand rotating Aa. slab, a lap,.and swinging means movable longitudinally of the axis of the slab for supporting and rotating said lap, thefaxs of the lap being disposed transverselyy of the axis of the slab.

2.' A machine oftheclass described,eom

aol

prising-means for; supporting and rotating i a slab, a lap, means kmovable longitudinally of the axis of the slab-for supporting` and. in

rotatingsaid lap, they axis ofthe lap being disposed `transversely ofthe axis of the slab,

-ment with and acrossthe periphery of slab.

3. A` machine of the described, comand means for moving the lap into enga# prising means for supporting androtating a y slab, a lao, means for supporting and rotating `said lap, the axis of the lap'beingdisposed transversely ofthe axisof the sla'b, andy a cam for moving the lap into engagement with and across' the periphery 'of the prising means for supportin and rotating a slab, a lap, means mova le longitudinally of the axis of the slab for su porting and rotating said lap, ythe axis o the lap being disposed transversely of the axis of the slab, means for moving the lap into engagement with and across the periphery of the slab, and means for movlng the lap out of operative position upon the completion of each operative movement thereof.

5. A machine of the class described, comprising means for supporting and rotating a slab, a lap, means for supfportin and rotating said lap, t-he axis o the ap being disposed transversely of the axis of the slab, a cam for moving the lap into engagement with and across the periphery of the slab, and means for moving the lap out of operative position upon the completion of each operative movement thereof.

6. A machine of the class described, comprising means for supporting and rotating a slab, a lap, a spindle upon which said lap is mounted, a movable support in which said spindle is rotatably mounted, the axis of said spindle being transversely disposed relatively to the axis ofthe slab, and means for movlng said Spindle to carry the lap across 'the peripheral portion of the slab.

'7, A machine'of the class described, comprising means for supporting and `rotating a slab, a lap, a spindle upon which said la is mounted, a movable supportin which sai -spindle is rotatably mounted, the axis of said spindle being transversel disposed relatively to the axis of the s ab, means for moving said spindle to carry the lap across the perlpheral portion of the slab, and means for restoring the spindle to its initial position after each operative movement thereof.

8. A machine of the class described, comprising means for supporting and rotating a slab, a lap, a spindle upon which said lap is mounted, a movable support .in which said spindle 'is rotatably mounted, the axis of said spindle being transversely disposed relatively to the axis of the slab, and a cam for moving said spindle to carry the lap across the peripheral portion of the slab. y,

9. A machine of the class described, comprising-means for s u porting and rotating a slab, a lap, means ,or sup rtin and rotating said' lap, the axis o the ap being disposed transversal ofthe axis of the slab, a cam for moving t e lap into engagement with and across the peripheryof the slab, and means for automatically stopping the cam upon the completion of each operative movement thereof.

10, A machine of the class described, com prising means for supporting and rotating a slab, a lap, a spindle upon which said"la is mounted, a movable support in which sai spindle 1s rotatably mounted, the axis of i the periphera spindle is rotatably mounted, the 1axis of Y said spindle being transversely disposed relatively to the axis of the slab, and means for rocking said support to carry .the lap across the peripheral portion of the slab.

12. A machine of the class described, comprising means for supporting and rotating a slab, a lap, a spindle upon which said lap is mounted, a rocking support in which said spindle is rotatably mounted, the axis ofv said spindle being transversely disposed relatively to the axis of the slab, and a cam for rocking said support to carry the lap across the peripheral portion of the slab.

13. A machine of the class described, comprising means for supporting and rotating a slab, a lap, a indle upon which said lap is mounted, a roc 'ng support in which saidl spindle is rotatably mounted, the axis of said spindle being transversely disposed relatively to the axls of the slab, a cam for rocking said support to carry the lap across the ,peripheral portion of the slab, and means for stopping the cam upon the completion of each operative movement' thereof.

14. A machine of the class described, comprising means for supporting and rotating a slab, a lap, as indle upon which said lap is mounted, a roc ing support in .which said spindle is rotatably mounted, the axis of saidV spindle bein transversely disposed relatively to the axls of the slab, a cam for rocking said support to carry the lap across the peripheral portion of the slab, means for stopping the cam upon the completion of 'each operative movement thereof, and means for moving said support in the opposite direction upon the completion of the operative movement thereof, v

15. A machine of the class described, comprising means for supporting and rotating a slab, alap, a spindle uponwhich said lap is mounted, armovable support in which said spindle is rotatably mounted, `the axis of said spindle being transversely disposed relatively to the axls of the slab, means for moving said indle to carry the lap across portion of the slab, and means for adjusting said support to move said spindle longitudinally of itself. j

16. A machine of the class described, comprising means'for supporting and rotating a slab, a lap, a spindle upon which said lap oi'iidv ohiiok for holding; oioiob ih ysaid spindle` being transversely disposed relatively to the axisof the.slab,a`iid trun- `lnons mounted.l i

bet-Ween whicl saidy support is Aa slab, a lap, a spindle kupon which said lap is mounted, a rocking support in which said spindle is rotatably mounted, the axis of said spindle being transversely disposed relatively to the' axis of the slab,- `a 'shaft forming the axis of said support,and trun- `nions engaging' the' ends of said shaft for pivotally supporting the same.

18. A machine of the class described, `comprising means for'supporting and rotating a slab, a lap, a spindle upon which said lap is mounted, a. rocking support in which said 'spindle is rotatably mounted, kthe axis of saidk spindle being transversely disposed relatively to the axis of the slab, a shaft forming the axis of said support, oppositely- `disposed blocks mounted upon said shaftand engaging. said support, and means pivotally `supporting' the end portions of said shaft-.-

19. ,A machine of the class*described,\com prising fia standard, a rotatable mandrel mounted on said standard,a chuck carried by saidfmandrel, means coperating with ition gitudinally; with reference `to the axis off said mandrel for grinding the slab, `and meansifor simultaneously rotating said lapv and mandrel at hi h speed.

v `20. A'machine o theclass described, comprising "a standard, a rotatable `mandrel mounted on. said standard, a chuck carried b vsaid mandrel, means coperating with .said chuck for holding a slab in position While'the same is rotated,`a rocking sup ort, a lap rotatably mounted u on said roc 'ng support and movable' longitudinally of the axis of said mandrel forgrinding the slab and means for simultaneously rotating said "f ymandrel vertically. l l

lap and mandrel at high speed. 21. A machine of the class described, comprising a standard, a krotatable mandrel mounted'jon said standard, a chuck carried h by said mandrel, means cooperatingv with `said chuck for holding a 'slab in while the same is rotated, a lap mova `1e lonsition `.,g'itudinall'"fwithy reference to the axisof `said man rel `for grinding the slab, means yfor rotating saidla-p, meansfor sinn'ilta-V 'Iieouslyf` rotating said lap and rmandrel at `high speed, andV means for adjusting the 22;v A machine of the class described, com

fmmmted onsaid standard, a chuckvcarried by said mandrel, means `coperating with grinding While the saine is rotated. a rocking sup` port. a lap rotatably mounted upon said rocking support and inovablelongitudinally f of the axis ofsaidmandrel-l bythe rocking of said support kfor grinding the slabfmeansA 1T. A machine of the class described, com\ yfor simultaneously rotatingsaid 1a and prising means foiysupporting and rotating l mandrel at high s eed, and'means orI ad? j listing the mandre vertically. h

" 23. A machine of the class described,`com.

prising a standard', a rotatable mandrel mounted on said standard, a chuck carried by said mandrel, means. coperatingfwith said chuck for lioldingkaslab in. sition while the same is rotated .,a lap mova le lon-r y gitudinallv with reference to the axis of said mandrel" for grinding the slab means,

for "rotating said lap, means for adjustin y, and means for hol l the mandrel vertical ing the standard against rotation.

24; A machine ofthe class described, comprisinga standard, a rotatable mandrel,A

ymounted von said standard, a `chuck carried l by said4 mandrel, means coperating with` said chuck for holding a slab in position while the same is rotated, a rocking supfirt,y ng

a lap rotatably mounted upon said` roc support, and movable longitudinally"othe axis of said mandrelby the rocking of siii' support for grindinga slab. means "for ad justing the mandrel vertically, and' means for holding the standard against rotation.

25. A machine of the'class described, comi i prising a standard, a rotatable mandrel mounted on said standard, a chuck carriedl by said mandreh'means mounted on said standard and cooperating with said chuck l for holdings slab in a sition while the same is rotated, a la Inova le longitudinallywith reference to t ef'axisof said mandrel forl grinding the slab, `and means" for simultaneously rotatingv said lapy and mandrel at high speed` 26. A ymachine' of the class described, com? i prising a standard, a` rotatable mandrel mounted on said standard, achuck carried .by said mandrel, means mounted on said standard and coperating with said chuck `for holding a slab in position -while the same is rotated, a rocking support,` and a Iap'jro tatably'mounted upon "said rocking support and movable longitudinally of the axis of said mandrel for grindingthe slab.,

` 27'.V Amachine of the classdes c ribed,`com i,

'prising vertically-adjustable standard, a

rotatablek mandrel mounted on said standard', a chuck carried by-said mandrehmeans mounted on the standard and, adjustablef therewith and coperating withjthe'chuckl for holding a slab in ,a sition while the same is rotated, a'la mova le longitudinally with reference to t e axis'ofx said mandrel` for said lap.

the slab, and means for"'i'oti'ntingl lmeans mounted on the standard and adjustable therewith and coperating with the chuck for holding a slab in position while the y same is rotated, a rocking support, and a lap rotatably' mounted upon sald rockin support and movable longitudinally of the Aaxis of said mandrel for grinding the slab.

.29. A machine of the class described, comprising a vertically-adjustable standard, a rotatable mandrel mounted on saidstandard, a chuck carried by said mandrel, means pivotally mounted u on the standard and coperating with sai chuck for holdin a slab in position while the same 1s rotate a lap movable longitudinally with reference to the axis of said mandrel for slab, and means`for rotating sald lap.

30. A machine of the class described, comprisin a vertically-adjustable standard, a rotata le mandrel mounted on said standard, a chuck carried by said mandrel, means pivotally mounted upon the standard and adjustable therewith and coperating'with the chuck for holding a slab in position while the same is rotated, a rocking s lpport, and a lap rotatably mounted upon sal rocking support and movable longitudlnally of the axis of said mandrel for grindlng the slab.

31. A machine of the class described, comprising a standard, a continuous tubular y" member carried thereby, a mandrel mounted in said tubular member, separated bearings for the end portions of said mandrel mountedl in said tubular member, caps mounted upon the end portions of said tubular member `for said bearings, a chuck connected inclosin with said mandrel, 'means coperating wlth said chuck for holding the work in operative position, means carried by the mandrel for rotating the same and a lap ada ted to operate upon'the work and mova le into and out of operative position.

32. A machine of the class described,.com

prising a standard, a continuous tubular member carried thereby, a mandrel mounted in said tubular member, bearings for said mandrel mounted in said tubular member, ca s mounted uoon the end portions of said tu ular member for inclosing said bearings, a chuck connected with said mandrel, a suprt carried by said standard above said tuular member, a slide-bar mounted in said support, an arm connected with said slidebar-and depending therefrom, and a center can'ied'by the chuck. l y

33. A hine of the class described, comprising a standard, a horizontal tubular member carried thereby, a mandrel mounted grinding the said arm in axial alinement with in said tublar member, bearin for said -mandrel mounted in said tubu ar member,

caps mounted upon the end portions of said tu ular member for inclosing said bearings, a chuck connected with said mandrel,

"neans carried by the mandrel for rotating the same, a support carried by said standard above said tu ular member, a slide-bar mounted in said support, an arm connected tending to move the center toward the chuck.

34. A machine of the class described, comprising a standard, a horizontal tubular member carried thereby, a mandrel mounted in said tubular member, bearings for said mandrel mounted in said ,tubular member, caps mounted upon the end portions of said tubular member for .inclosin said bearings, alchuck connected with sai mandrel, means carried by the/mandrel for rotating the same, a support carried by said standard above said tubular member, a slidevbar mounted in said supnort, an arm connected withsaid slide-bar andl depending therefrom, a center carried by said arm in axial alinement with the chuck, a tendi to move the center toward the chuck, and a andle carried by the slide-bar.

' 35. In a machine of the class described, the combination of a tubular pedestal, a standard non-rotatably mounted in said pedestal and movable vertically therein, means for movin said standard vertically, a horizontal tubuir member carried by said standard, a mandrel rotatably mounted inA Ysupporting the lap.

36. In a machine of the class described, the combination of a tubular pedestal, a standard non-rotatably mounted in said pedestal and movable vertically therein, means for movin said standard vertically, a horizontal tubuir member carried by said standard, a mandrel rotatably mounted in said tubular member, means carried by the mandrel for rotatin the same, caps inclosing the ends of sald tubular member, a chuck carried by said mandrel, means carried by the standard and coperating with the chuck for holding the work, a lap for grinding 4the work, and means independent of said standard for supporting the lap.

37.. In a machine of the class described, the combination of a tubular pedestal, a standard non-rotatably mounted in said pedestal and movable vertically therein,A

chuck carried bg r member carried by said said tubular member, means carried by the mandrel for rotating thesame, caps lnclosingthe ends of said tubular member, a said mandrel, means pivotally carried the standardto swing about a verticalr axis and coperatng with the chuck for holding the work, a lap for grinding the work, and means independent `of said standard for supporting the lag.ed

38. In a machine of the class descri the combination of a1. tubular pedestal, a standard non-rotatably mounted in said pedestal d and' movable vertically therein,`

means for movin said standard vertically,

`a horizontal tub ar member carried by said standard, a mandrel rotatably mounted in said tubular member, means carried by the mandrel for rotating the same, caps inclosing the ends of said tubular member= a yehuck carried by said mandrel, means pivotally -carried by the standard to swing about a vertical axis and coperating wlth the chuck for holdin the work, a lap for the wor means independent of said standard for supporting the lap, and means for locking the latter member against rotation. n y

39.` In a machine of the class described, the

combination with a tubular memberfof a rotary shaft extending therethrou h, a pulley mounted on said shaft outsi e of saidy tubular member, bearings in said tubular member lsupporting said shaft, caps at the end portions of s'aid tubular lmember for,

closin the same, and a rotary cap mounted Aon said shaft and rotating therewith, said rotary cap extendinmover one of the ends of sald tubular mem r. f n

40. In a machine of the class described,` the combination with a tubular member, of( a rotary shaft extending therethrou h, a pulley mounted on said shaft outside o said tubular member, bearings in said tubular member supporting said shaft, caps at the end portions of said tubular member for closing the same, and a rotary cap mounted on said shaft and rotating therewith, said rotary ca extending over one of saidfirstmentlone caps. 41. A machine of the class described com-` prising means for rotatably supporting a slab with its margin exposed, a lap mounted to rotate in a lane which intersects thev plane of the sla and having its periphery arranged to engage and grind the marginal" l ADRIAN GABUS `when f 

